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RUC cross-section of frontogenesis, negative theta-e lapse rates and omega valid 6/27 18 UTC.

RUC cross-section of frontogenesis, negative theta-e lapse rates and omega valid 6/27 18 UTC.

Notes:

The frontogenesis pattern on this slide indicates a weak frontal zone, sloping from southeast to northwest across New York State. Again, flash flooding was occurring in a zone where upward motion, indicated by the ageostrophic circulation streamlines, was co-located with instability (negative theta-e lapse rates, indicated by purple shading).